Replace query and client attribute bitfield with named bools

Replace query and client attribute bitfield with named bools

Replace the unsigned int attributes field in struct ns_query with
individual bool bitfields.  This removes the NS_QUERYATTR_* constants
and the 12 accessor macros (USECACHE, RECURSIONOK, RECURSING, etc.)
from query.c, replacing all bit manipulation with direct bool access.

And replace the unsigned int attributes field in struct ns_client_inner
with individual bool bitfields.  This removes the NS_CLIENTATTR_*
constants and the accessor macros (TCP, WANTDNSSEC, etc.), replacing
all bit manipulation with direct bool access.